2012 R2 Hyper-v - VM import - change the drive that has VM data

This is all in the same host, and not upgrade from 2008. I had VM data on HDD, and I copied to SSD that I just added.
VM A. Domain Controller with only C drive
VM B. File Server with C drive, and D data drive

Q1- when you import, 1) do I choose Register or Restore? I did not quite understand the difference. Right now, neither choice succeeds because I have not deleted / de-registered the current VM instance. So I assume that first I have to "delete" from Hyper-V Manager. 2) Is that right and enough?

Q2- For VM B, I want to move only C drive to SSD, and the vhdx that will contain shared files and folders will remain in HDD, even though I copied that vhdx onto SSD (right now it is very small, but is expected to grow bigger than the SSD) How do I keep this relationship when I import VM?

2: Use Storage Live Migration (R.Click VM --> Move --> Storage --> Select specific). That will move the storage to the new SSD setup. If the VHDX being moved to the SSD will grow larger than the SSD itself the VM will go Paused-Critical. That's not a good place to be. The SSD should be larger than the VHDX file.

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Is it not because I have not "deleted" the existing, original VM from Hyper-v manager?

Also, is OPTION 3 OK for domain controller? I was going to "delete" the existing, original VM from Hyper-v manager, then choose OPTION 1 or 2, but I was not sure which one. But now, is OPTION 3 the one I need?

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